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rights on /dev/ttyS0

lagerschaden
in Allwinner sunxi

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Hi,

 

can anybody tell me, why the rights on the serial port ttyS0 are R/W for the user (root), but only W for the group (tty) ??? 

crw--w---- 1 root tty 251,  0 Jan 24 19:45 /dev/ttyS0

Hardware is orangepi one, OS is Linux pi-one 3.4.113-sun8i #6 SMP PREEMPT Tue Jan 16 14:36:25 CET 2018 armv7l GNU/Linux

 

I can change the rights with chmod, but the change is not permanent after a reboot.

L.

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